National Research Council (U.S.). Highway Research Board. (1957). Night visibility 1957: Presented at the Thirty-sixth Annual Meeting, January 7-11, 1957. Highway Research Board.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Research Council (U.S.). Highway Research Board. Night Visibility 1957: Presented at the Thirty-sixth Annual Meeting, January 7-11, 1957. Washington: Highway Research Board, 1957.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNational Research Council (U.S.). Highway Research Board. Night Visibility 1957: Presented at the Thirty-sixth Annual Meeting, January 7-11, 1957. Highway Research Board, 1957.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.